CVE-2024-39839

Remote username set to an arbitrary string by remote user

State: Published
Severity: 4.3 Medium
Published: Aug 1, 2024
Updated: Aug 1, 2024
Reserved: Jul 23, 2024

Description

Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the local server as long as the user hadn't been synced before.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	Mattermost

Weaknesses

CWE-284 Improper Access Control

Affected Products

Product	Versions
MattermostMattermost	9.9.0Affected 9.5.0 through 9.5.6Affected 9.7.0 through 9.7.5Affected 9.8.0 through 9.8.1Affected 9.10.0Not affected 9.9.1Not affected 9.5.7Not affected 9.7.6Not affected 9.8.2Not affected

References

https://mattermost.com/security-updates

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.